Space

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Across
  1. 2. A cloud of gas and dust in outer space.
  2. 4. An ___ is composed of atoms that have the same atomic number.
  3. 5. What happened 13.8 billion years ago?
  4. 7. A what orbits around a star
Down
  1. 1. The charged central core
  2. 2. A proton or neutron.
  3. 3. A bright figure in the sky
  4. 6. stars, gas, and dust show signs or what?